what do you mean? The OP didnt come up with the concept of a smoking vacuum leak detector. What he drew out was just a schematic of the basic things you need to make one yourself. Every commercial smoking vacuum detector is based around the same basic parts...a low pressurized air source to force the smoke into the engine, some way to regulate it, a way to generate engine component/sensor safe smoke and the plumbing to hook it all together and to the engine...